The VS-504 from Vectron International is a Voltage Controlled SAW Oscillator with Frequency 600 to 3000 MHz, Output Power 0 to 6 dBm, Phase noise -159 to -97 dBc/Hz, APR(pullability) ±20 ppm, Supply Voltage 3.13 to 3.465 V. More details for VS-504 can be seen below.